MATERIALS SCI.+ENGR.:INTRO.-NEXTGEN
MATERIALS SCI.+ENGR.:INTRO.-NEXTGEN
10th Edition
ISBN: 9781119503941
Author: Callister
Publisher: WILEY
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Chapter 2, Problem 1QAP
To determine

The difference between atomic mass and atomic weight

Expert Solution & Answer
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Explanation of Solution

Write the difference between atomic mass and atomic weight in tabular form.

S. no Atomic mass Atomic weight
1 It is defined as adding the number of protons and neutrons in atom. It is defined as average weight of an element, with respect to all isotopes and their abundance.
2 One atomic mass unit (amu) is the one twelfth of the mass of the C-12 isotope. Ratio of the average mass per atom of the element to 1/12 of the mass of atom of C-12.
3

Expression of atomic mass.

AZ+N

Here, A is for atomic mass, Z is for atomic number and N is for neutrons.

Expression for atomic weight of element.

A¯M=ΣifiMAiM

Here, M is for an element, A¯M is for fraction-of-occurrence-atomic weight, AiM is for atomic weight of the isotope, fiM is for fraction-of-occurrence of isotope (i) for element.

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